256Mb, 3V Multiple I/O Serial Flash Memory
SUSPEND/RESUME Operations
SUSPEND/RESUME Operations
PROGRAM/ERASE SUSPEND Operations
A PROGRAM/ERASE SUSPEND command enables the memory controller to interrupt
and suspend an array PROGRAM or ERASE operation within the program/erase latency.
To initiate the command, S# is driven LOW, and the command code is input on DQn.
The operation is terminated by the PROGRAM/ERASE RESUME command.
For a PROGRAM SUSPEND, the flag status register bit 2 is set to 1. For an ERASE SUS-
PEND, the flag status register bit 6 is set to 1.
After an erase/program latency time, the flag status register bit 7 is also set to 1, but the
device is considered in suspended state once bit 7 of the flag status register outputs 1
with at least one byte output. In the suspended state, the device is waiting for any oper-
ation.
If the time remaining to complete the operation is less than the suspend latency, the de-
vice completes the operation and clears the flag status register bits 2 or 6, as applicable.
Because the suspend state is volatile, if there is a power cycle, the suspend state infor-
mation is lost and the flag status register powers up as 80h.
It is possible to nest a PROGRAM/ERASE SUSPEND operation inside a PROGRAM/
ERASE SUSPEND operation just once. Issue an ERASE command and suspend it. Then
issue a PROGRAM command and suspend it also. With the two operations suspended,
the next PROGRAM/ERASE RESUME command resumes the latter operation, and a sec-
ond PROGRAM/ERASE RESUME command resumes the former (or first) operation.
PROGRAM/ERASE RESUME Operations
A PROGRAM/ERASE RESUME operation terminates the PROGRAM/ERASE RESUME
command. To initiate the command, S# is driven LOW, and the command code is input
on DQn. The operation is terminated by driving S# HIGH.
Table 31: SUSPEND/RESUME Operations
Operation Name
Description/Conditions
PROGRAM SUSPEND (75h)
A READ operation is possible in any page except the one in a suspended state. Reading
from a sector that is in a suspended state will output indeterminate data.
ERASE SUSPEND (75h)
A PROGRAM or READ operation is possible in any sector except the one in a suspended
state. Reading from a sector that is in a suspended state will output indeterminate data.
During a SUSPEND SUBSECTOR ERASE operation, reading an address in the sector that
contains the suspended subsector could output indeterminate data.
The device ignores a PROGRAM command to a sector that is in an erase suspend state; it
also sets the flag status register bit 4 to 1 (program failure/protection error) and leaves
the write enable latch bit unchanged.
When the ERASE resumes, it does not check the new lock status of the WRITE VOLATILE
LOCK BITS command.
CCMTD-1725822587-3368
mt25q-qljs-L256-ABA-xxT.pdf - Rev. K 07/18 EN
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